Kurtosis as a Decisive Topographic Parameter for Pitting Attack of AISI 304L Stainless Steel

Alireza Kalhor; Mohammad Javad Sohrabi; Mohammad Mobasheri; Kinga Rodak; Changiz Dehghanian; Hamed Mirzadeh

doi:10.1002/maco.202414782

Kurtosis as a Decisive Topographic Parameter for Pitting Attack of AISI 304L Stainless Steel

Alireza Kalhor
, Mohammad Javad Sohrabi
, Mohammad Mobasheri
, Kinga Rodak
, Changiz Dehghanian
, Hamed Mirzadeh

University of Tehran
Swiss Federal Institute of Technology Lausanne

Research output: Contribution to journal › Article › peer-review

Abstract

The effects of the centerline average (R_a), kurtosis (Rku), and Cr concentration at the surface on the pitting corrosion resistance of AISI 304L stainless steel were studied based on the modification of the corroding surface by mechanical polishing and electropolishing routes. The values of E_P − E_corr, E_P − E_rp, and i_P were devised as the quantitative measures of pitting resistance, where E_P is the pitting potential, E_rp is the repassivation potential, E_corr is the corrosion potential, and i_P is the passive current density. Preliminary, the improved resistance against pitting corrosion was associated with the reduced R_a and the elevated Cr concentration on the surface. However, more intense analysis revealed that the samples with Rku < ~3 (platykurtic distribution) exhibited a good resistance to pitting attack, irrespective of the values of R_a and Cr content. Accordingly, the importance of the Rku as a decisive topographic parameter for pitting attack was established.

Original language	English
Pages (from-to)	935-940
Number of pages	6
Journal	Materials and Corrosion
Volume	76
Issue number	7
DOIs	https://doi.org/10.1002/maco.202414782
Publication status	Published - Jul 2025

Keywords

austenitic stainless steels
corrosion testing
kurtosis
localized pitting
surface modification

ASJC Scopus subject areas

Environmental Chemistry
Mechanics of Materials
Mechanical Engineering
Surfaces, Coatings and Films
Metals and Alloys
Materials Chemistry

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10.1002/maco.202414782

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title = "Kurtosis as a Decisive Topographic Parameter for Pitting Attack of AISI 304L Stainless Steel",

abstract = "The effects of the centerline average (Ra), kurtosis (Rku), and Cr concentration at the surface on the pitting corrosion resistance of AISI 304L stainless steel were studied based on the modification of the corroding surface by mechanical polishing and electropolishing routes. The values of EP − Ecorr, EP − Erp, and iP were devised as the quantitative measures of pitting resistance, where EP is the pitting potential, Erp is the repassivation potential, Ecorr is the corrosion potential, and iP is the passive current density. Preliminary, the improved resistance against pitting corrosion was associated with the reduced Ra and the elevated Cr concentration on the surface. However, more intense analysis revealed that the samples with Rku < \textasciitilde{}3 (platykurtic distribution) exhibited a good resistance to pitting attack, irrespective of the values of Ra and Cr content. Accordingly, the importance of the Rku as a decisive topographic parameter for pitting attack was established.",

keywords = "austenitic stainless steels, corrosion testing, kurtosis, localized pitting, surface modification",

author = "Alireza Kalhor and Sohrabi, \{Mohammad Javad\} and Mohammad Mobasheri and Kinga Rodak and Changiz Dehghanian and Hamed Mirzadeh",

note = "Publisher Copyright: {\textcopyright} 2025 Wiley-VCH GmbH.",

year = "2025",

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doi = "10.1002/maco.202414782",

language = "English",

volume = "76",

pages = "935--940",

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TY - JOUR

T1 - Kurtosis as a Decisive Topographic Parameter for Pitting Attack of AISI 304L Stainless Steel

AU - Kalhor, Alireza

AU - Sohrabi, Mohammad Javad

AU - Mobasheri, Mohammad

AU - Rodak, Kinga

AU - Dehghanian, Changiz

AU - Mirzadeh, Hamed

PY - 2025/7

Y1 - 2025/7

N2 - The effects of the centerline average (Ra), kurtosis (Rku), and Cr concentration at the surface on the pitting corrosion resistance of AISI 304L stainless steel were studied based on the modification of the corroding surface by mechanical polishing and electropolishing routes. The values of EP − Ecorr, EP − Erp, and iP were devised as the quantitative measures of pitting resistance, where EP is the pitting potential, Erp is the repassivation potential, Ecorr is the corrosion potential, and iP is the passive current density. Preliminary, the improved resistance against pitting corrosion was associated with the reduced Ra and the elevated Cr concentration on the surface. However, more intense analysis revealed that the samples with Rku < ~3 (platykurtic distribution) exhibited a good resistance to pitting attack, irrespective of the values of Ra and Cr content. Accordingly, the importance of the Rku as a decisive topographic parameter for pitting attack was established.

AB - The effects of the centerline average (Ra), kurtosis (Rku), and Cr concentration at the surface on the pitting corrosion resistance of AISI 304L stainless steel were studied based on the modification of the corroding surface by mechanical polishing and electropolishing routes. The values of EP − Ecorr, EP − Erp, and iP were devised as the quantitative measures of pitting resistance, where EP is the pitting potential, Erp is the repassivation potential, Ecorr is the corrosion potential, and iP is the passive current density. Preliminary, the improved resistance against pitting corrosion was associated with the reduced Ra and the elevated Cr concentration on the surface. However, more intense analysis revealed that the samples with Rku < ~3 (platykurtic distribution) exhibited a good resistance to pitting attack, irrespective of the values of Ra and Cr content. Accordingly, the importance of the Rku as a decisive topographic parameter for pitting attack was established.

KW - austenitic stainless steels

KW - corrosion testing

KW - kurtosis

KW - localized pitting

KW - surface modification

UR - https://www.scopus.com/pages/publications/85216475011

U2 - 10.1002/maco.202414782

DO - 10.1002/maco.202414782

M3 - Article

AN - SCOPUS:85216475011

SN - 0947-5117

VL - 76

SP - 935

EP - 940

JO - Materials and Corrosion

JF - Materials and Corrosion

IS - 7

ER -

Kurtosis as a Decisive Topographic Parameter for Pitting Attack of AISI 304L Stainless Steel

Abstract

Keywords

ASJC Scopus subject areas

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